<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>画盒子</title>
  <style>
    .red {
      width: 200px;
      height: 200px;
      background-color: red;
    }
    .orange {
      width: 500px;
      height: 300px;
      background-color: cadetblue;
    }
  </style>
</head>
<body>
  <div class="red">div1</div>
  <div class="orange">div2</div>
</body>
</html>